12691143 has 12 divisors (see below), whose sum is σ = 18495360. Its totient is φ = 8385216.

The previous prime is 12691109. The next prime is 12691169. The reversal of 12691143 is 34119621.

12691143 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 12691143 - 2⁶ = 12691079 is a prime.

It is a super-2 number, since 2×12691143² = 322130221292898, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12691103) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5223 + ... + 7256.

It is an arithmetic number, because the mean of its divisors is an integer number (1541280).

Almost surely, 2^12691143 is an apocalyptic number.

12691143 is a deficient number, since it is larger than the sum of its proper divisors (5804217).

12691143 is a wasteful number, since it uses less digits than its factorization.

12691143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12598 (or 12595 counting only the distinct ones).

The product of its digits is 1296, while the sum is 27.

The square root of 12691143 is about 3562.4630524400. The cubic root of 12691143 is about 233.2564057063.

The spelling of 12691143 in words is "twelve million, six hundred ninety-one thousand, one hundred forty-three".